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Climatic Implications of Loess Deposits from the Beijing Region

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Climatic Implications of Loess Deposits from the Beijing Region JOURNAL OF QUATERNARY SCIENCE (2001) 16(6) 575–582 Copyright 2001 John Wiley & Sons, Ltd. DOI: 10.1002/jqs.618 Climatic implications of loess deposits from the Beijing region SHANGFA XIONG∗, ZHONGLI DING and TUNGSHENG LIU Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Xiong, S., Ding, Z. and Liu, T. 2001. Climatic implications of loess deposits from the Beijing region. J. Quaternary Sci., Vol. 16 pp. 575–582. ISSN 0267-8179. Received 10 August 2000; Revised 10 January 2001; Accepted 19 January 2001 ABSTRACT: Variations in magnetostratigraphy, pedostratigraphy, grain size and magnetic suscep- tibility of the loess deposits near Beijing have been studied at two sections. The sections are about 400 km east of the main loess deposits in China, have a maximum thickness of 100 m and extend back to 1.1 Ma. The sequence consists of 14 loess–palaeosol couplets (S0-S14), which correlate well with sequences in the Loess Plateau. Susceptibility records from the sites near Beijing are comparable to the Xifeng, Luochuan and Baoji sections located in the middle part of the Loess Plateau; however, the down-core variations in the grain size in the Upper Lishi Formation exhibit some differences. Journal of Quaternary Science The median grain size increases by about 25–30 µm from L4 to L2, with the sandy grains (>63 µm) increasing from 10–20 wt% to 40–50 wt% . This implies that the depositional environment of the dust sources in the Beijing loess section is different in some aspects from the Loess Plateau. The Beijing loess may have had a different dust source than the Loess Plateau. Copyright 2001 John Wiley & Sons, Ltd. KEYWORDS: loess; Beijing; susceptibility; grain size; desert. Introduction Previous studies have shown that loess deposits are widely distributed in China, within and beyond the Loess Plateau (Liu et al., 1965, 1985). The study of loess deposits outside Chinese loess is an important archive of climatic and the Loess Plateau should enhance our understanding of environmental changes over East Asia during the Quaternary loess depositional processes and palaeoclimatology outside (Liu et al., 1985; Kukla et al., 1988; Liu and Ding, 1998; the Loess Plateau, and the connection between the loess Kukla and An, 1989; Rutter et al., 1990; An et al., 1991; depositional regions and the deserts. However, little attention Ding et al., 1992, 1994; Xiao et al., 1995). The main has been paid to the loess deposits beyond the Loess Plateau. body of information about Chinese loess stratigraphy and Here we investigate the loess deposits in the Beijing region. palaeoclimatology is from the Loess Plateau in the central part The Beijing region is an important site of loess deposition of northern China (Liu et al., 1985; Kukla and An, 1989; Rutter east of the Loess Plateau (von Richthofen, 1882; Andersson, et al., 1990; Ding et al., 1992). Studies during the last two 1939; Barbour, 1929; An and Lu, 1984; Liu et al., 1985; Lu decades have revealed that climatic cycles, represented by the et al., 1987). Based on magnetostratigraphic, pedostratigraphic loess–palaeosol alternations, are dominated by variations in and sedimentological approaches, a correlation between the monsoon circulation over East Asia, which show a coherent loess near Beijing and that in the Loess Plateau is made here. variability with respect to global ice-volume cycles (An et al., In addition, palaeoclimatic implications and the connections 1991; Ding et al., 1992, 1994, 1995). The loess deposits in with the desert source areas are also discussed. the Loess Plateau commonly are believed to be derived from deserts west and/or north of the plateau (Liu et al., 1965, 1982, 1985; Zhang et al., 1994; Ding et al., 1999). Thus the Loess Plateau and the deserts can be regarded as a coupled Geological setting environmental system in terms of a sediment source and sink relationship. The study area is located in the northwest part of Beijing, in the eastern part of North China (40°30 N, 115°10 E; Fig. 1). The * Correspondence to: Shangfa Xiong, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China. E-mail: xiongsf@public2. mean annual precipitation is approximately 500–680 mm, east.net.cn and primarily occurs during summer. The mean annual temperature is approximately 8–12.1°C, with the highest Contract/grant sponsor: National Key Project for Basic Research (China); Contract/grant number: G1998040800. temperature occurring during July and the lowest temperature Contract/grant sponsor: National Science Foundation of China; Contract/grant in January. Geomorphologically, the Bejing region is marked number: 49894170. by an alternation of mountains and sedimentary basins. 576 JOURNAL OF QUATERNARY SCIENCE 100° 105° 110° 115° 120° 115°E 116°E A B 0 10 20 30km 45° 45° C Mongolia Zhangjiakou Hunshandake desert ° ′ Yellow River 40°40′N 40 40 N 40° Beijing 40° Loess Plateau Sanggan River YanqinHuailai-Zhoulu Basin Fanshan Yongding River ° Lanzhou Yellow River 35 Luochuan 35° 0 200 400km Baoji ° ° ° ° 120° 115°E 116°E 100 105 Xi’an 110 115 Zhaitang D Lacustrine Fluvial Modern Bedrock or Gobi Desert Loess sediment sediment Lake other sediments Figure 1 Location map for Beijing (A) with an inset map (B) showing loess distribution near the Beijing region (cross-section C–D is shown in Fig. 2) Figure 2 A transect from northwest to southeast across the loess deposits in the Beijing region The largest basin is the Yanqin-Huailai-Zhoulu Basin (YHZ Beijing region (Fig. 2). These loess-mantled terraces can be basin). The most proximal desert is the Hunshandake desert used for reconstructing the history of the river aggradation and (21 400 km2), which lies to the northwest. downcutting (Porter et al., 1992). The terraces are designated The present margin of the Hunshandake desert is about T1 to T6, with the oldest one being T6. The T6 terrace is found 180–200 km northwest of the loess deposits in the Beijing on the margin of the YHZ basin. The top of this terrace is region. Most of the sand dunes in the Hunshandake desert covered by loess units L15 to L1. Terrace T5 also is found on are inactive or have been anthropogenically reactived at the margin of the YHZ basin as well as adjacent to some river present. Holocene sandy soils are present near the centre of banks. It is covered by loess units S9 to S0. Terraces T4,T3,T2 the desert. However, during glacial periods the Hunshandake and T1 are widely distributed, and are overlain by S5, S2, S1 desert probably was covered by shifting dunes and was a and L1, respectively. source of dust for the loess deposits (Sun et al., 1998). Six Typical loess features are observed in deposits 180–280 km terraces have been recognised in the loess-covered area of the southeast of the Hunshandake desert, whereas transitional Copyright 2001 John Wiley & Sons, Ltd. J. Quaternary Sci., Vol. 16(6) 575–582 (2001) LOESS IN THE BEIJING REGION 577 aeolian sandy–loess deposits were observed about 90 km Magnetostratigraphy and pedostratigraphy south of the desert. The loess occurs mainly on uplands along the piedmonts of the mountains and covers terraces of different heights. The loess is commonly about 10–20 m The magnetic reversal stratigraphy of the Fanshan section is thick, with a maximum thickness of about 100 m. The loess illustrated and correlated with the well-established geomag- deposits thin from the YHZ basin in the north towards the netic polarity time-scale (Cande and Kent, 1995) in Fig. 3. The south. Loess sections were described and sampled at numerous section covers the Brunhes normal and part of the Matuyama localities on the oldest terrace (T6) in the Beijing region. reversed polarity zone. The magnetic reversal sequence is The thickest loess deposit, the Fanshan section, is located similar to that determined previously at Luochuan (Heller and in the southern part of the YHZ basin. This section consists Liu, 1982; Liu et al., 1985; Kukla and An, 1989), Xifeng (Liu of 14 loess–palaeosol couplets and is underlain by fluvial et al., 1987; Kukla and An, 1989), Xi’an (Zheng et al., 1992) pebbly conglomerates. Other loess sections, including the and Baoji (Rutter et al., 1990; Ding et al., 1993). The Brun- Zhaitang section, located 70 km northwest of Beijing (the hes–Matuyama magnetic reversal is observed in soil unit S8 type section of the Malan Loess formation), also have been (66.5 m). The upper and lower reversals of the Jaramillo sub- investigated. chron are assigned respectively within soil unit S9 (74 m) and S12 (88 m). A few data points apparently yield normal polarity above the Jaramillo (Fig. 3). This feature also can be seen in the magnetostratigraphy of the Baoji section (Rutter et al., 1991); Methods the normal polarity data points may be overprinted samples that have not responded to laboratory cleaning (Heller and Evans, 1995). By linear extrapolation, the age of the base of The recognition of distinct palaeosol units has been used to the Fanshan section is about 1.18 Ma. differentiate the loess–palaeosol units in the Beijing sections Most of the sections are composed of the Malan Loess (Rutter et al., 1991; Ding et al., 1992). The Si–Li system was Formation and the Upper Lishi Loess Formation, whereas the used to label the alternations of palaeosols and loess (Liu et al., Fanshan section consists of the Malan Loess, the Upper Lishi 1985; Rutter et al., 1991). Loess and the Lower Lishi Loess. Palaeomagnetic measurements were made at the Paleo- The upper unit at Fanshan section is S0, termed the magnetism Laboratory, Institute of Geology and Geophysics, Black Loam, and has a maximum thickness of about 2–3 m.
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